Rotor Drive Speed Control for Spinning Mill Sliver Quality
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Solution Overview
Problem
Existing spinning mill preparation machines face issues with particle accumulation and detachment during high-speed fiber sliver deposition, leading to 'mice' formation and quality problems, which existing technologies fail to prevent effectively.
Innovation Solution
A device with a drive system that temporarily reduces the turntable speed during fiber sliver deposition, using a predefinable speed profile to increase the fiber sliver diameter and sweep the inner channel surface, preventing particle accumulation by automatically controlling the turntable speed and drive interruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the turntable speed is maintained at a high basic speed during fiber sliver deposition, then the productivity is improved, but particle deposits accumulate on the inner wall of the sliver channel
Solution Approach 1:
The patent applies periodic speed reduction to the turntable during sliver deposition. The turntable speed is temporarily reduced according to a predefinable speed profile during continuous depositing, creating periodic cleaning cycles that remove particle deposits before they form harmful clusters, while maintaining high overall productivity through rapid resumption of basic speed.
Solution Approach 2:
The patent changes the speed parameter of the turntable dynamically during operation. By temporarily reducing the turntable speed from the basic high speed according to a predetermined profile, the linear velocity of the sliver changes, which modifies the forces acting on particles and enables their removal from the channel wall without permanent loss of productivity.
2Object-generated harmful factors
If the turntable speed is temporarily reduced to clean particle deposits, then the particle accumulation is prevented, but the productivity is reduced
Solution Approach 1:
The cleaning function is implemented through periodic, temporary speed reductions rather than continuous slow operation. The turntable maintains high basic speed for most of the time, with brief intervals of reduced speed that are sufficient to remove particle deposits, thus minimizing productivity loss while achieving effective cleaning.
Solution Approach 2:
The speed reduction is applied in advance to prevent particle deposits from growing into harmful clusters. By temporarily reducing speed before significant accumulation occurs, the system performs preventive cleaning that requires minimal time interruption, thereby protecting productivity while eliminating particles before they cause problems.
3Manufacturing precision
If the turntable speed is increased to maintain cycloidal deposit pattern, then the deposit quality is improved, but the fiber sliver may be damaged at very high speeds
Solution Approach 1:
The patent makes the turntable speed dynamic rather than fixed. The speed is continuously adjusted according to a predefinable profile that temporarily reduces velocity during deposition, allowing the system to adapt between maintaining cycloidal pattern quality and preventing sliver damage through controlled speed modulation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively removes detached particles before they form clusters, ensuring a clean channel and maintaining the cycloidal deposit pattern without damaging the fiber sliver, thus ensuring high-quality sliver production at high speeds.
Implementation Method 1
the speed of the turntable is temporarily lowered in such a way that it leads to a short-term reduction in the longitudinal tension in the fiber sliver and thus to a short-term increase in the diameter of the fiber sliver
Implementation Method 2
As a result, the entire inner surface of the sliver channel is swept by the running fiber sliver
Data Source
Figure 1
Figure 2
Figure 3~5
AI summary
The rotor (10) drive system (26) reduces the rotor speed (DG) below the normal speed (GG) for a brief interval, during continuous deposition of the fibrous band (FB) into the spinning bin (K). The speed reduction follows a given profile. This ensures a drop in fibrous band tension, during speed reduction. A prescribed drive interruption and/or a speed profile is imposed. An electronic controller (27) in the drive system (26) manages the operation. The controller exchanges data with the machine control system (13), or is integral with it. Speed profiles and/or drive interruption profiles are stored in memory. The profile is a function of time, or a function of fibrous band length. Speed is reduced in accordance with the profile, by preferably up to 1.5%-3%. The profile is a repeating sequence, comprising an interval of normal speed, and another of speed reduction. During the first interval, preferably less than 150 m of fibrous band is conveyed. During the second, preferably less than 3 m is conveyed. Various control mechanisms can be used. A clutch is operated by the controller, or a drive unit with controlled velocity ratio is used. A variator belt drive is a further possibility. Alternatively a differential drive unit (33) is installed; this includes a brake or auxiliary motor. A speed-controlled motor, can be connected to the rotor by fixed gearing. The bin (12) carrier is constructed for rotation or oscillatory translation.